By some reason I thought since the begining of the overhauling that the gearbox was in a nice condition. Thus, I didn’t reviewed it. In fact, I didn’t even emptied the oil. During the overhauling of the SV13 the time arrived to check the gearbox. I switched the power on… and the gearbox made an intense rattling noise in some speeds 🤨.

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Nothing annoys more to me that a machine loosing oil and spilling it on the floor. Despite this, many machines are designed with not too much attention to this detail and lost oil mechanisms are usual. The Schaublin 13 has also some mechanisms that loose oil by design and some of them spill the oil on the floor.. ugly design I would say.

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Old mechanical sewing machines are a true gift: robust, nice, effective and useful. Refurbishing them is, however, not so easy. Screws, particulary, are most of them made following old norms or simply following no norms. This is the story of a Singer sewing machine screw.

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Because of reasons, I needed to cross drill some shafts with some weird diameters. I own an old imperial Reglus drilling jig but I didn’t have the required bushings. I decided to make some of them. This post shows how drilling bushings where made.

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The drilling press was modified by a previous owner. As it can be seen in the picture below, someone added an intermediate pulley in the driving train to reduce the rotation speeds. What was the motor pulley became the intermediate pulley and a new single step pulley was fitted to the motor shaft. I have some doubts about the origin of this variation: would it be made at the Wörner factory after a specific requirement by a client?

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Some of the parts of the Wörner B13 were originally blackened. Rust have ruined most of those finishings. Thus I was faced to polish them to clear metal or try to recover original black coating. I found interesting to experiment with those cold blackening solutions and give them a try. What follows is the resulting experience. The parts to be processed were: The screw plug of the quill retention. The handle and bearing support of the belt tensioning pinion.

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One of the jobs done this summer is a special square intended to facilitate the alignment of the grinder axis. I own a Klaiber WSII tool grinder. This grinder has a head with several degrees of freedom and aligning it to the table is not easy given the poor quality of the head scales. Thus, I decided to build a particular square that fits in the head nose and offers a reference plane to test with the indicator or the protractor, for instance.

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sBs

An unusual computer engineer working on dirty and greasy machines

Catalonia